The cam you have is a Ford Motorsport cam. The letter E is a short way of describing which cam you have. Your cam is the E303 grind which is a good mild street cam. It will work well with EFI or Carbeuration. for more details about lift and duration got to the FRPP website all Ford's cams are listed there.
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2004 Torch Red GT
Flowmaster Am.Thunder cat back, SLP Mid Pipe
Steeda Underdrive pulleys
3.73 gears
Diablosport Predator tune
Grille Delete and Mach 1 spoiler
Rear Wing delete 
Mustang Tuning Shifter
Bullitt Handling Kit
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